In all my reading of the discussions, I see this theme of making sure you pick songs that go along with the sermon topic for that Sunday. Why is that? In all my years growing up in church I don't think I ever noticed from one Sunday to the next wether the songs matched the sermon theme. Nor have I, as a worship leader ever felt compelled to do that, and the HS still moves powerfully in our worship (music and message).
Is there some scriptural guideline that I'm missing? I'd love to hear people's thoughts on this.